<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    let arr = [
        ['小明', '18'],
        ['小刚', '20'],
        [
            [1,
                [3, 4],
                [5, 6],
                [
                    [7],
                    [8]
                ]
            ]
        ]
    ]

    console.log(arr.flat(Infinity));
</script>
</body>
</html>
